The Sob (Russian: Собь) is a river in Yamalo-Nenets Autonomous Okrug, Russia.

Since it is of relatively easy access, the river has become a tourist attraction as a Class I to IV destination for rafting and kayaking.

After leaving the mountainous area, the river flows roughly southeastwards and southwards among small lakes in a floodplain located at the northwestern end of the West Siberian Plain.

Finally the Sob meets the left bank of the Ob near Katravozh, about 322 km (200 mi) from its mouth.

[3][1][5] The main fish species in the river are muksun, peled, broad whitefish, nelma, and sturgeon.